package com.macro.mall.tiny.common.utils;

import javax.servlet.http.HttpServletRequest;

/**
 * <b>IpUtil.java</b></br>
 *
 * <pre></pre>
 *
 * @author tanghailan tanghailan@88.com
 * @date 2021年04月11日 17:25:04
 * @since JDK 1.8
 */
public class IpUtil {
  /**
   * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址,
   *
   * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？
   * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。
   *
   * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130,
   * 192.168.1.100
   *
   * 用户真实IP为： 192.168.1.110
   *
   * @param request
   * @return
   */
  public static String getIpAddress(HttpServletRequest request) {
    String ip = request.getHeader("x-forwarded-for");
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getHeader("Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getHeader("HTTP_CLIENT_IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getHeader("HTTP_X_FORWARDED_FOR");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getRemoteAddr();
    }
    return "0:0:0:0:0:0:0:1".equals(ip) ?"127.0.0.1":ip;
  }

}
